vhf’s gists

vhf / debug-appsignal.ex

Created September 16, 2025 19:45

	defmodule SAppsignal.Span do
	defstruct [
	:kind,
	:reason,
	:stack,
	:name,
	:extra
	]

	def set_name(span, name) do

vhf / valid.ex

Created December 10, 2024 15:12

	defmodule Foo.Helpers do
	@doc """
	Validates that all keys in the input params are defined in the schema.
	Adds an error to the changeset if any unexpected keys are found.

	`validate_no_unused_attributes/2` accepts a list of permitted keys that might not be in the schema.

	## Examples

	iex> params = %{"bar" => "bar", "baz" => "baz", "unexpected" => "wow"}

vhf / sandbox.ex

Last active July 24, 2024 21:02

	defmodule SecureSandbox do
	@forbidden_modules [File, System, Code, Process, :erlang]
	@forbidden_functions [:eval, :apply, :spawn, :send, :exit]

	def new do
	Agent.start_link(fn -> %{binding: [], env: __ENV__} end)
	end

	def eval(pid, code) do
	Agent.get_and_update(pid, fn state ->

vhf / distinct-vs-limit-1-union-all.md

Last active June 2, 2024 12:39

state

SELECT
  queue,
  count(1) FILTER (WHERE state = 'available'),
  count(1) FILTER (WHERE state IS NULL OR state != 'available')
FROM oban_jobs
GROUP BY queue;

vhf / avg.exs

Created April 11, 2024 15:48

oban job average duration

	Oban.Job
	\|> where([j], j.completed_at > ago(5, "minute"))
	\|> select([j], fragment("EXTRACT(epoch FROM avg(? - ?))::int", j.completed_at, j.attempted_at))
	\|> Repo.one()

vhf / elixir-node-latency.iex

Last active April 29, 2021 18:43

	iex([email protected])29> Node.list \|> Enum.map(fn node -> Enum.map(1..100, fn _ -> {us, :pong} = :timer.tc(Node, :ping, [node])
	...([email protected])29> us/2 end)\|> Enum.reduce(fn x, sum -> sum + x end) end) \|> Enum.map(fn x -> x / 100 end)
	[413.585, 436.995]

vhf / worstresignations.py

Created December 9, 2020 20:31 — forked from void4/worstresignations.py

	import chess
	import chess.pgn
	import chess.engine
	from chess import BLACK, WHITE

	engine = chess.engine.SimpleEngine.popen_uci("./stockfish_20090216_x64_avx2")

	import bz2
	path = "lichess_db_standard_rated_2017-04.pgn.bz2"
	f = bz2.open(path, "rt", encoding="ascii")

vhf / foo.ex

Created September 25, 2020 11:04

Number of weekdays between two dates (elixir)

	defmodule Foo do
	def bar(first_day, second_day) do
	days_between = Date.diff(second_day, first_day) + 1
	dow1 = Date.day_of_week(second_day)
	dow2 = Date.day_of_week(second_day)

	weekend_days =
	Kernel.floor((days_between + dow2) / 7 * 2) +
	if(dow1 == 7, do: 1, else: 0) - if(dow2 == 6, do: 1, else: 0)

vhf / fix-svg.js

Last active March 31, 2018 14:24

rehype svg attributes fix

	// complete list of camelCase attributes
	// https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute
	const camelAttributes = [
	'allowReorder', 'attributeName', 'attributeType', 'autoReverse',
	'baseFrequency', 'baseProfile', 'calcMode', 'clipPathUnits', 'contentScriptType',
	'contentStyleType', 'diffuseConstant', 'edgeMode', 'externalResourcesRequired',
	'filterRes', 'filterUnits', 'glyphRef', 'gradientTransform', 'gradientUnits',
	'kernelMatrix', 'kernelUnitLength', 'keyPoints', 'keySplines', 'keyTimes', 'lengthAdjust',
	'limitingConeAngle', 'markerHeight', 'markerUnits', 'markerWidth', 'maskContentUnits',
	'maskUnits', 'numOctaves', 'pathLength', 'patternContentUnits', 'patternTransform',

vhf / how-to-make-a-racist-ai-without-really-trying.ipynb

Created July 27, 2017 08:56 — forked from rspeer/how-to-make-a-racist-ai-without-really-trying.ipynb

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victor felder vhf

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